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Tractor Talk Discussion Forum

901 swaps

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lightintn

01-13-2005 13:39:47




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I have 901 diesel that has a select o matic. It refuses to move after backing up. and will not go either direction now. I talked to several people they say it will be expensive to fix< I was wondering is it possible to use this motor on a 3000 model with a clutch instead of fixing the old selecto matic.




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IanC

01-13-2005 20:29:27




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 Re: 901 swaps in reply to lightintn, 01-13-2005 13:39:47  
Get ahold of a FORD service manual, and do a complete maintenance and adjustment on your transmission before you panic, it may not be as bad as you"re thinking.



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geok

01-13-2005 15:19:11




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 Re: 901 swaps in reply to lightintn, 01-13-2005 13:39:47  
It wouldn't be a good idea even if it could be done. The 901 diesel is basically a converted gas engine.



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snitkawl

01-14-2005 05:14:32




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 Re: 901 swaps in reply to geok, 01-13-2005 15:19:11  
I may be misinterpreting the tone of your post, but you seem to be saying that because the engine is based on a gas engine design, it is a bad engine. If that is your assumption, then I must assume that you have very little or no knowledge of that particular engine, because it is a very good engine and well worth swapping into another tractor.



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paul

01-14-2005 07:41:25




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 Re: 901 swaps in reply to snitkawl, 01-14-2005 05:14:32  
Not to wade into another's conversation with my big rear, but I've always heard the 3 cylinder was designed for diesel & gives much longer & more reliable service than the 4 banger that was a gas based engine converted diesel life?

If I owned a tractor with a 3 cyl diesel, I would consider it a downgrade to put a 4 banger in it - if such a swap is possible.

--->Paul



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James2

01-14-2005 19:23:37




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 Re: 901 swaps in reply to paul, 01-14-2005 07:41:25  
Paul:
My father purchased a Ford 961 in the fall of 1958 which had a 4 cyl diesel. The engine failed within two years. Ford repaired the engine and installed internal balancers. We did not have any problems after that. An inline four cylinder is inherently more unbalanced than an inline three cylinder. I'm assuming that the crankshaft rod "throws" are not offset. The only good way to fix this is to add a crankshaft balancer. These are commonly two half shafts, running along the crankshaft operating one-half engine speed. If space is a limitation, the balancer can be concentrated (narrow) one-half weights/gears also operating at one half engine speed. But this introduces other moments which can result in other dynamic problems. A lot of OEM's will add more mass to the lower components (if needed for life), then try to use a flexible/dampening mounting system, In my opinion this is really only a band-aid and at best will only be marginally satisfactory, never really good. But none-the-less, I have seen a lot of "marginally satisfactory", highly cost effective arrangements during my tenure. The balancers add rotating mass so they do have a slight negative effect on acceleration, but it generally would still be light years better than a two cyl Deere. OEM's generally deal with three cylinder engine "shake" by optimizing the mounting arrangement which is theoretically more easily acomplished than on an unbalanced four cylinder. However, I have seen several production machines with "rocking and rolling" three cylinders. Bottom line is that I have seen/worked with 3 and 4 cylinder engines, balanced and unbalanced, and would rather have a balanced 4 cylinder rather than a 3 cyl. However, both take a back seat to the old tried and true inline 6 cyl.

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timberjack

06-22-2005 11:01:53




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 adding engine balancer to 4 cylinder 172 diesel?? in reply to James2, 01-14-2005 19:23:37  
I have two 4 cylinder 172's, one is a gas that the engine seized. Recently purchase a 172 diesel on a skid, not sure if it has engine balancer. Can an engine balancer be added to the diesel at a reasonable cost?



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geok

01-14-2005 14:47:34




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 Re: 901 swaps in reply to paul, 01-14-2005 07:41:25  
I have had to swap out the 172 diesel with a 172 gas in a couple of the 801 series due to broken cranks and block damage. The older 4 cylinder 172 was a gas designed with just 3 main bearings. This set up was just fine for gas but was not for diesel. I still remember reading the FoMoCo service bulletin advising dealers not to reistall a turned crank in the diesel models. It was advised to install a new crank instead to minimise the chance of breakage.

This doesn't mean that everyone who owns a 172 diesel should change out their motors. I have costomers who have had 801s diesels and some with SOS that have had 2+ decades of reliable service and would not part with their tractors. But times are changing and a lot of parts for the SOS and not available any more.

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